Center portion of a sweeper brush



FIG. 1 is a top view of a center portion of a sweeper brush showing my new design; and,

FIG. 2 is a sectional view along line 2—2 of FIG. 1.

The broken line representations of items in FIGS. 1 and 2 are for purposes of illustration only, and form no part of the claimed design. 

The ornamental design for a center portion of a sweeper brush, as shown and described. 